Import images?

[Kallenovsky]

I've downloaded a brilliant Curtis Axel CAW recently and noticed custom images for hair as well as for his trunks. I've looked through the game only to be stuck with that pain in the butt creator. Am I completely overlooking an import image part somewhere? I'm good with Photoshop so I'd like my CAWs to have great designs. Also, is there a set image size I need to work with to make it all fit together? I'm totally new to nodding this series.